How to increase or decrease the amount of total timing/centrifugal advance in a Mopar distributor.

How to increase or decrease the amount of centrifugal advance in a Mopar distributor. Below is a list of slot size measurements, and the corresponding distributor degrees. Dist deg. Crank Deg. slot length 6 deg 12 0.340 7 deg 14 0.355 8 deg 16 0.375 9 deg 18 0.390 10 deg 20 0.405 11 deg 22 0.420 12 deg 24 0.435 13 deg 26 0.447 14 deg 28 0.460 15 deg 30 0.475 16 deg 32 0.490 17 deg 34 0.505 18 deg 36 0.520